Answered: Styling button text to auto-wrap

In a post by Mitchell Simoens, he sugggested to override the x-button-label that sets these properties: overflow : hidden, white-space : no-wrap and text-overflow : ellipsis. I tried making a class that sets the white-space to normal and applying it to the cls: field of my button.

Unfortunately, the button text isn't wrapping. Inspecting the elements it appears that my class is being applied to the button, but the label of the button is using the x-button-label class. Since I don't really want to change the style of all my buttons, just a few, how can I set the label class of my button?